You may have seen cleaning products described as pH-neutral, acidic or alkaline, but what does that actually mean, and why does it matter when you’re cleaning?
The pH of a cleaning product is one part of its formulation. Different pH levels can help tackle different types of dirt, grease and mineral deposits, which is why cleaning products are formulated differently. There isn’t one “best” pH for cleaning. Acidic, neutral and alkaline cleaners all have a purpose. The key is matching the cleaning chemistry to the job, not just the pH.
What Is pH?
pH measures how acidic or alkaline a water-based solution is.
The pH scale generally runs from 0 to 14:
- Below 7 – acidic
- Around 7 – neutral
- Above 7 – alkaline
The further you move below 7, the more acidic the solution becomes; the further you move above 7, the more alkaline it becomes. An interesting feature of the pH scale is that it is logarithmic. A change of one pH unit represents approximately a tenfold change in acidity or alkalinity.
Why Does pH Matter in Cleaning?
Different types of dirt and deposits have different chemical characteristics. The pH of a cleaning product can help create the right conditions to loosen, dissolve or remove particular types of soil.
This is why a bathroom descaler, an everyday surface cleaner and a kitchen degreaser don’t necessarily use the same chemistry. Rather than thinking of acidic, neutral and alkaline cleaners as stronger or weaker, think of them as different tools for different cleaning jobs.
Acidic Cleaners
Particularly Useful for Mineral Deposits
Acidic cleaners have a pH below 7 and can be particularly useful for tackling mineral-based deposits and build-up, including:
- limescale
- hard-water deposits
- mineral build-up
- rust staining
- some bathroom and toilet deposits
This is why acidic ingredients are commonly used in products such as descalers, toilet cleaners and specialised bathroom cleaners.
Some materials, including certain natural stones, are sensitive to acids, so always check the product directions and surface recommendations before use.
pH-Neutral Cleaners
Ideal for Many Everyday Cleaning Tasks
A pH-neutral cleaner sits around the middle of the pH scale, but neutral doesn’t mean weak. A well-formulated neutral cleaner can use surfactants and other cleaning ingredients to loosen and remove everyday dirt, oils and residues.
Depending on the formulation, pH-neutral cleaners can suit routine cleaning and surfaces where strongly acidic or alkaline chemistry isn’t needed or could damage the surface.
However, pH-neutral doesn’t automatically mean safer, gentler, natural or suitable for every surface. pH describes just one characteristic of the formulation, so it’s still important to check that the product is designed for the surface you’re cleaning.
Alkaline Cleaners
Effective Against Grease and Oily Soils
Alkaline cleaners have a pH above 7 and can be particularly effective at removing grease, fats, oils and many organic soils, including:
- cooking grease
- fats and oils
- food residues
- built-up kitchen grime
- some laundry soils and stains
This makes alkaline chemistry particularly valuable in degreasers, kitchen cleaners, laundry products and other products designed to tackle oily or stubborn soils.
Is One pH Better Than Another?
No. The appropriate pH depends on the cleaning job.
An acidic formulation may be exactly what is needed to dissolve stubborn mineral scale, while an alkaline formulation may be better suited to cutting through cooking grease. For everyday cleaning, a pH-neutral formulation may provide the cleaning performance you need.
It’s not about finding the strongest or “best” pH, it’s about using the right chemistry for the job.
When Is pH Important When Choosing a Cleaning Product?
For most everyday cleaning jobs, you don’t need to know a product’s exact pH. What matters more is choosing a cleaner designed for the surface and cleaning task.
However, pH matters more when cleaning pH-sensitive surfaces. Natural stone surfaces such as marble and limestone are good examples, as acidic cleaners can react with the stone and cause etching or dulling. For routine cleaning, a pH-neutral cleaner labelled as suitable for the stone type is often recommended.
The important point is not to rely on pH alone. Check the label for what the product is designed to clean, which surfaces it is suitable for and any precautions or directions for use.
pH Is Only Part of the Cleaning Formula
While pH can influence how a cleaner works, it is only one part of the overall formulation.
Cleaning products contain different combinations of ingredients selected for the job they need to do. These may include:
- Surfactants – help loosen dirt and oils so they can be wiped or rinsed away.
- Solvents – help dissolve certain oily, greasy or sticky residues.
- Acids – help dissolve mineral deposits and scale.
- Alkaline ingredients – help tackle grease, fats and some organic soils.
- Enzymes – break down specific components of stains, such as proteins, starches and fats.
Other ingredients may help with water hardness, wetting, foaming, stability or maintaining the desired pH.
This is why two products with a similar pH can perform very differently. Cleaning performance depends on the complete formulation, what the product is designed to clean, and how it is used.
The Bottom Line: Choose the Right Cleaner for the Job
Understanding pH can help explain why cleaning products are formulated differently, but you don’t need to get hung up on the pH number every time you choose a cleaner.
There is a reason why there isn’t one product that does everything. Mineral scale, everyday dirt, grease and other types of grime are different, and the surfaces we clean have different needs too. Manufacturers formulate products for particular cleaning jobs and use the label to communicate what the product is designed to clean, where it can be used and how to use it effectively.
So rather than searching for the “best” pH, start with the job at hand: What are you trying to clean, and what surface are you cleaning? Choose a product designed for that purpose, check the label for surface suitability and follow the directions.
A little knowledge about pH simply helps you understand why the right cleaner for one job may be completely different from the right cleaner for another, and that’s exactly how it’s meant to be.